What calendars does theSkimm App integrate with? December 11, 2019 19:17 Updated Glad you asked. theSkimm App is compatible with iCal and Google Cal. But we have a lot more up our sleeves. Stay tuned. Related articles How do I get the Calendar? How much does it cost? I just added one of the calendars, but I'm not seeing it. What does “The Big Stuff” mean? What is the Calendar?